Help Sql Wizards

here is my dilemna...

I wish to retrieve values from the TICKERMASTER.TICKER table where

TICKERMASTER.TICKER IS NULL OR

TICKERMASTER.LASTDATE < DATE() OR

TICKERMASTER.LASTDATE = DATE() AND TICKERMASTER.EOD = FALSE

and in call cases output TICKERMASTER.TICKER, TICKERMASTER.LASTDATE AS LAST

except in the third OR command above, I would like the output changed to TICKERMASTER.TICKER, (TICKERMASTER.LASTDATE -1) as LAST

???? How the heck would I do that?  My SQL code is below your help is appreciated........

SELECT TickerMaster.Ticker, TickerMaster.LastDate AS [Last]
FROM TickerMaster
WHERE TickerMaster.LastDate Is Null OR
TickerMaster.LastDate <= Date() and TickerMaster.EOD =FALSE;
 

Table < TICKERMASTER >

Ticker FirstDate  LastDate  EOD
ABXA 1/12/2007 1/12/2008 No
AIRN                                 No
ALY                                   No